Henri carbonelle



(No Model.)

H. OARBONELLE.

MICROPHONE.

No. 542,822. Patented Jul 16, 1895.

Fig. 1'.

UNITED STAT PATENT OFFICE.

HENRI CARBONELLE, OF BRUSSELS, BELGIUM.

MICROPHONE.

SPECIFIGATION forming part of Letters Patent No. 542,822, dated July 16, 1895.

Application filed October 9, 1894. Serial No. 525,421. (No model.)

ments in Microphones, of which the following is a specification.

The main object of the present invention is to give a great sensitiveness to microphones while the changes in the resistance are relatively great, in order to be able to converse at great distances without induction-coils, so that the battery-cells at the homes of the parties using the telephone can be removed and located at the central office, and to construct the microphone in such a manner that it can be moved in all directions and at different angles. In the second place my microphone can be used while retaining the induction-coil as in use now, and in that case it possesses the great advantage that the electrical energy employed can be greatly reduced.

The microphone-button is free at one end, While the other is rigidly connected with the vibrating plate by means of a second hollow elastic tube which is smaller and shorter than the former.

Thevibrating plate of the microphone is constructed of suitable material, such as pasteboard, sheet metal, ebonite, (be.

The said microphone is inclosed in a round box carried by a shank which ends in 'a'ball of metal. The shank and the ball'consist of two insulated parts. Each of the parts of the shank is rigidly connected with one of the parts of the ball. The entire system is mounted upona shelf in which a hollow space is provided for removing the ball. A spiral or other spring presses the ball against a metallic disk.

The main support for the instrument is provided with two clamps, one of which is connected with the conducting-wire and the other with the earth or with the returning conducting-wire. The arrangement is such that the conducting-wire is connected with one of the small microphone-'disksby means of one of the parts of the ball, while the returning wire or the earth is connected with the other disk by means of the other part .of the ball. Both disks are in electrical connections by the small pieces of coke.

The construct-ion enables me to give to the microphone a rotary motion or an inclined position without interrupting the connection.

The invention is illustrated in the accompanying drawings, in which- Figure 1 shows a vertical section of the complete microphone system. Fig. 2 is a top 'a manner that when the cover H, with which the resonance-cup O is in contact, is screwed on top the metallic conducting contact-leaves andthevibrating plate or are held, the former bearing against the springs, whereby the proper microphonic body is connected with the rest of the system. To the middle of the plate ma hollow tube L is pasted, to which the carbon disk P is fixed. A flexible tube- I is drawn over the little disk P and is closed at the opposite end by a second disk P. These disks, with the tube I and granular filling, constitute the carbon-button. The space M within the tube is filled with small pieces of coke or other slightly-conducting substances. The spring N, as has been stated, already establishes the conducting connection between D and P by the wire f, which is soldered on one side to the contact-leaf O of the plate or and on the other side to the carbon-disk P The same is the case for the connection of E by E, N ,f and P. The contact-spring N is connected with the con- ,tact-screw b by the wire e and the contactwhere it is submitted to the variations of the resistance which are communicated to it by the vibrations. When leaving M the current it: I

passes through P, f N, E, E, F, d, and a, hence to the earth, and if the line is double, then again to'the central station. Instead of connecting the wire f with P and f with I it is also possible to connectf with P and and f with P Second. \Vith induction-coil the current is generated at the house of the subscriber. The operation is the same as in other microphones. Instead of connecting the clamps a and b with the line-wire, said clamps serve to connect the wire ends of a primary current branch of an induction-coil of a suitable resistance.

I clairn 1. In combination,thevibrating diaphragm, the carbon button having the disks connected by the flexible tube and the filling of carbon granules, the conductors connecting with the disks said carbon button being suspended from the vibrating diaphragm by an intermediate flexible connection, substantially as de' scribed.

2. In combination the vibrating plate, the casing G, the bell mouth casing II fitted thereto, the carbon button connected with the vibrating plate, the contacts secured between the meeting parts of the casings Gand H, the conductors leading from said contact leaves to the disks of the carbon button, the shank upon which the casing G is supported and the conductors N N extending from the said shank to the contacts.

In witness whereof I have hereunto set my hand in presence of two witnesses.

HENRI CARBONELLE.

\Vitnesses:

ALFRED WUNDERLICH, GREGORY PHELAN. 

